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The joint between the sacrum and the hip bone is the sacroiliac joint. It is also known as the SI joint. They form the articular surfaces.
The inferior articular process or facet of the vertebra above.
The fused articular processes
The sacrum has a base, an apex, and three surfaces: a pelvic, dorsal and a lateral surface.
At articular surfaces. And epiphysial plates in children
the sacrum is located in the back
hyaline cartilage
Menisci
true
articular cartilage
articular cartilage
ankylosis of a joint means fusion of the articular surfaces renderring the joint immobile